You could substitute car guy and racer as almost equal terms. I'm a racer, so that's how I think. If it wasn't for racing I wouldn't be a car guy. Ricers will also say they are car guys. I suppose we need a term to describe someone who likes cars but isn't a racer or ricer.
I'd like to add that car guy also means car girl. Saying car guy is shorter than car guy/girl.
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